Devices used by cashiers or at self-checkouts for the purpose of selling products to customers. These run a wide variety of operating systems, including desktop variants of Windows, Linux versions, and Unix, embedded versions of this software, and sometimes even older systems such as DOS. CPU architectures are not as wide-spanning, usually featuring x86 or ARM.

Simply and plainly stated by the manufacturer. There's a lot of pictures out there showing things like this on a Windows desktop, or an Android crash screen.

https://www.elotouch.com/pos-terminals.html